Judah, Jethro and Cale are my favorites but I'd probably spell it Kael or Kale.

Julius
Arutha
Kaspar
Athol
Gage
Lucien
Silas
Jory
Steele
Reid
Garrett
Kade
Axel
Marcin
Berk
Arlo
Gabriel
Zane
Zephyr
Jules


DS has a swimming teacher named Blade